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Chapter 4 Performance specification
4-9
4.2.2 RS-422 interface
Channel RS-422 uses 6-pin connector (Terminal Block) for communication with external devices. The names and
functions of pins and data directions are as shown in [Figure 4.7] below.
[Figure 4.7] Pin specifications of 6-pin connector for RS-422
Pin No. Name
Signal direction
(Cnet<-->external devices)
Description
1 RDA(RXA) Received data(+)
2 RDB(RXB) Received data(-)
3 SDA(TXA) Transmitted data(+)
4 SDB(TXB) Transmitted data(-)
5 S.G(SG) Ground line for signal
6 F.G Ground line for frame
Contents in ( ) of the name mean terminal specification of G7L-CUEC.
Channel RS-422 is designed as available to connect RS-422 and RS-485(multi-drop) with external devices. When
RS-422 channel is used as multi-drop, set channel RS-422 to RS-485 communication in setting menu of RS-422
communication type of Frame Editor, and use the terminals of RS-422 as connected as shown in [Figure4.9].
[Figure4.8] shows an example of connecting communication cable in RS-422 communication.
[Figure 4.8] RS-422 connection
Computer link side
Pin No. Name
Signal direction
(Cnet<--->external devices)
External communication device
1 RDA(RXA) SDA
2 RDB(RXB) SDB
3 SDA(TXA) RDA
4 SDB(TXB) RDB
5 S.G(SG) S.G
6 F.G F.G